Electrokinetic phenomena in electrical insulating oil/impregnated cellulosic pressboard system

A new method for measuring the zeta potential has been developed which exists on the surface of the cellulosic pressboard impregnated with an electrical insulating oil while the oil streams through the capillary holes in the pressboard. The metal salts of di-(2 ethyl-hexyl) sulpho-succinate were dissolved in a purified insulating oil, the zeta potential and AC electric conductivity were investigated. The dependence of the zeta potential on the type and concentration of the salt was clarified. It would be safe to say that in electrical insulating oil the electrokinetic phenomenon could be dealt with in the same manner that it has been dealt with in the aqueous solution so far.